The invention discloses a short circuit power frequency electrical quantity calculating method for a power system comprising a doubly-fed induction generator. The method comprises the steps of simplifying a circuit of the doubly-fed induction generator when power grid faults occur to obtain an equivalent circuit of the doubly-fed induction generator, then substituting the equivalent circuit of the doubly-fed induction generator into a power grid system, and lastly solving short circuit power frequency electrical quantities of the power system based on matrix operation of a power grid theory. The short circuit power frequency electrical quantity calculating method for the power system comprising the doubly-fed induction generator can consider the influence of electromagnetic transient process of the doubly-fed induction generator and convector excitation control, the equivalent circuit can express the influence at a time point of a key fault, the equivalent circuit can be in parallel connection with a traditional equivalent circuit model of an alternative power grid, so that fault initial and fault steady state electrical quantity of a power system can be calculated by utilizing an electric network. Power system fault voltage and current calculated through the method have high accuracy.